The ArcGIS export is only available from this 32-bit version of ioGAS as the ArcGIS software is only available in 32-bit. Therefore you will need to install the 32-bit version of ioGAS to access this feature. If you are running 64-bit windows you can install both the 32-bit and 64-bit versions of ioGAS and licence them both using the same licence file. Server licence users just need to enter the server details into each installation (this is still equivalent to one server licence file).
You must have the ArcGIS program installed on your computer as ioGAS uses your ArcGIS software to generate the gdb and lyr files.